APA ציטוט

Kunz, R. M. (1971). The challenge of life. Switzerland: Basel and Stutgart.

Trích dẫn kiểu Chicago

Kunz, Robert M. The Challenge of Life. Switzerland: Basel and Stutgart, 1971.

ציטוט MLA

Kunz, Robert M. The Challenge of Life. Switzerland: Basel and Stutgart, 1971.